[Lazarus] Oddity in uninstalling packages

[C Western]

Just updated to the current trunk where I presume virtual tree view has 
been added. Starting lazarus (trunk from a few days ago) gives an error 
message about it not being found, and creates a dummy package. Trying to 
rebuild lazarus then fails as virtualtreeview is absent. I didn't think 
I needed it, so I try uninstalling it (double click on the package in 
the package graph and select uninstall) but it prompts to save a file, 
which seems very counter-intuitive - I don't want it, so why should I 
save it?

(Allowing the save to proceed and then building again reveals that the 
package is required by the package manager, and opening the virtual tree 
view package in the components directory allows the build to proceed.)

Colin